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So, your grandparents worked very hard. Well, so did mine -- on the other side of the management/labor divide. My grandfather did long days at an auto plant for most of his life. He lost his hearing from the factory noise, slipped discs in his back from lifting, and started his days at 4AM for the entire time I knew him. Thankfully for his family, his union felt that vacation time was not an option.
So by all means, work as hard as you like. Avoid vacations if you want to, dedicate your life to grabbing the brass ring by whatever means you feel appropriate. But that's your choice. When people no longer have the luxury to choose not to live like that, we've gone far off the rails.
And not for nothing: I'll wager that your grandparents didn't work hard with the intention that their grandchildren would have to spend their lives working for a company that never gave them time off.